CLIFFORD, Pat. How to Make Fertiliser Balls for Aquatic Plants. Sibbaldia: the International Journal of Botanic Garden Horticulture, [S. l.], n. 10, p. 197–201, 2012. DOI: 10.24823/Sibbaldia.2012.86. Disponível em: https://journals.rbge.org.uk/rbgesib/article/view/86. Acesso em: 4 jul. 2025.